The productivity of ethyl 3-hydroxybutyrate could be attained 96.6% under the following optimum conditions:3-hydroxybutyric acid 0.1mol,ethanol 0.12mol,paratoluenesulfonic acid (0.717 5g),cyclohexane 50mL,CaO18.7g and reaction time 3h.

• 当原料配比为:0 1mol3-羟基丁酸、0 12mol乙醇,0 7175g对甲苯磺酸,带水剂环己烷50mL,脱水剂18 7g氧化钙,反应时间3h时,产品3-羟基丁酸乙酯的收率可达96 6%25(质量分数,下同)。